1930s rectangular steel vintage Omega watch

A rectangular steel vintage Omega watch. The case measures 20 x 36 mm (including lugs). The case is signed Omega, Fab. Suisse, Acier Staybrite and numbered. The T-17 movement is signed Omega, with 15 jewels and numbered, with a protective dust cover. The two-tone silvered dial has black Roman numerals at the quarters, with a subsidiary seconds dial and fine blued steel hands. The dial is signed Omega above the centre.